Benchmark: Object Keys vs Entries 2

Tests:

Keys
const test = { level_id_1: {id: 1}, level_id_2: {id: 2}, level_id_3: {id: 3}, } Object.keys(test).map(keys => { let a = {}; const keysplit = keys.split('_'); const level = keysplit[keysplit.length - 1]; a[`level${level}_id`] = test[keys]?.id; return a; })
Entries
const test = { level_id_1: {id: 1}, level_id_2: {id: 2}, level_id_3: {id: 3}, } Object.entries(test).map(entry => { let a = {}; const keysplit = entry[0]; const level = keysplit[keysplit.length - 1]; a[`level${level}_id`] = entry[1]?.id; return a; })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Keys
Entries

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:104.0) Gecko/20100101 Firefox/104.0

Browser/OS: Firefox 104 on Windows

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Test name	Executions per second
Keys	1538222.5 Ops/sec
Entries	2890781.2 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and explain what's being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark measures the performance of two approaches to access nested objects in JavaScript: using `Object.keys()` and `Object.entries()`. The test cases are designed to create an object with multiple levels of nesting, where each key has a corresponding ID value.

**Test Case 1: "Keys"**

This test case uses `Object.keys()` to iterate over the object's keys. Here's what happens:

* `Object.keys(test)` returns an array of strings representing the object's keys.
* `.map` is applied to this array, creating a new array with transformed key-value pairs.

The transformation involves:
	+ Splitting each key by `_` using `split('_')`.
	+ Extracting the last part of the split string (`level`) as a variable.
	+ Creating an object literal `a` and assigning the corresponding ID value to it.
	+ Returning the modified object `a`.

**Test Case 2: "Entries"**

This test case uses `Object.entries()` to iterate over the object's key-value pairs. Here's what happens:

* `Object.entries(test)` returns an array of arrays, where each inner array contains a key-value pair.
* `.map` is applied to this array, creating a new array with transformed key-value pairs.

The transformation involves:
	+ Extracting the first element of the inner array (`keysplit`) as a variable.
	+ Extracting the last part of `keysplit` (`level`) as a variable.
	+ Creating an object literal `a` and assigning the corresponding ID value to it.
	+ Returning the modified object `a`.

**Comparison**

The benchmark compares the performance of these two approaches:

* **Keys**: Uses `Object.keys()` to iterate over keys, then maps each key to create a new object with the ID value.
* **Entries**: Uses `Object.entries()` to iterate over key-value pairs, then maps each pair to create a new object with the ID value.

**Pros and Cons**

* **Keys**:
	+ Pros:
		- May be faster since it only needs to access the keys array once.
		- Can be more readable for developers familiar with `Object.keys()`.
	+ Cons:
		- Requires iterating over the keys array, which may lead to slower performance for large objects.
* **Entries**:
	+ Pros:
		- Only needs to iterate over the key-value pairs, reducing overhead.
		- Can be more efficient since it avoids the need to split keys using `split('_')`.
	+ Cons:
		- May require more complex transformations, potentially leading to slower performance.

**Library and Special Features**

In both test cases, no external libraries or special features are used. The focus is on the built-in JavaScript methods: `Object.keys()` and `Object.entries()`.

**Alternatives**

If you're looking for alternative approaches, consider:

* Using a library like Lodash or Ramda to simplify key-value pair manipulation.
* Employing a different data structure, such as a Map or an array of objects, which may offer better performance for certain use cases.
* Utilizing modern JavaScript features like destructuring or arrow functions to simplify transformations.

Keep in mind that the best approach depends on your specific requirements and performance constraints.

Related benchmarks:

Object Keys vs Entries 2 (version: 0)

Comparing performance of: Keys vs Entries

Created: 2 years ago by: Guest

Jump to the latest result

Keys

Entries

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):